An expanded line of LED light tubes are available with 5- and 10-mm diameter options. The M-tube LED light system provides lighting options for electronics and is designed for applications including medical products. The light guides are rugged with a strong plastic light bar tube that stays cool even when brightly lit. The tubes provide reliability in adverse conditions and are resistant to shock and vibration. The tubes are available in a variety of colors that include RGB types. Flexible color imprinting allows various widths and patterns so that the light can be beamed as a narrow spotlight or spread wider for large-area lighting. Elma Electronics Inc., Fremont, CA, 510/656-3400.